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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e48c0b5abeb90e5dffff8573c07999adcb9b20a7732163c1d70b2be4ce1d32' 
  AND token = 'iTkL7VyC99WY9kEjDPSNsHTNalqn1HkAmpP9Si21uE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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