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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219fa560672d4aa02349802a72ea264a2fcf269ef5c17952945587265e39b1eb' 
  AND token = 'NYaaig2txpheHjZQ6Mqp7pDh4BJKerW0w4EREqaj/dg=' 
  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"
    }
  }
}