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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3455c47a917caffcb55efe96978c5b2ec8515368729f8881a260c8589df7306' 
  AND token = 'rPHGCRRmbpsuily5YI691Qiu82g4olycc9CegRau9hs=' 
  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"
    }
  }
}