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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb2c233dee45e9236127ab3f0ae59223150625aa47d0946b72f189f1efee2d2' 
  AND token = 'T73xKL3ymj35frSN95s/FlkHuEgdEHUsgw+kNNbF+eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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