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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196c0b41061b0d4b72a64247a20e5e819d190ca6e0aa50ce90bd120bf041981d' 
  AND token = 'vDgFL/kpEJlES4WaN1JbMJRNcY8ZSReV/SekXV4CxEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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