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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a04223934fc5d8167b73db064b9af1490d2f7cb56f4ed2dad7cef211d9a67bf' 
  AND token = 'j7oAhhe/EpWYDmm/wLz0Rv4S2srSMI+3Cf9QUPMy0V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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