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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489cd17e07ee0dcd8ffbc5e34c091e36b35b83d83bae551e6918715e0cfb412c' 
  AND token = '2W+BbeuhL3mXBOg6ukqD2Qedgn2P1t5APGUq3V27os4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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