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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a48079efa04e71b5968bc999e02bd97a90d0f90fae829ee2f38d756f4f37005' 
  AND token = 'R5SKEeBY+TBHPhBhPAt47gmD3ISIiy7NEIHha4hbR0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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