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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978270d4639a7f28f0d0672792b077bea0f5c2dfb85c3b01191ea67bc58f2ade' 
  AND token = 'ftm2JLUsLiuRhmtuumAoAfKeHcUYf2Wqu/w+kLKoEUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}