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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad37feb4bd5e97fae0e1dac0be7d341c58082ffbb7b1b4ca4e7a6890df653c32' 
  AND token = 'FrQ1M8ios7hu29rNP1kmQoDEW1c9xzeVhHiMTAOefhI=' 
  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"
    }
  }
}