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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7564fa5cbc5b3fb3d61eb4271315cbdb506953765e686fd8003bd0eb2a5e2630' 
  AND token = '3uK2S7fjVCy3pU4/RfhrDWpPOQ7wHSbfeIOEPQmIagQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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