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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c8d144ba8e8a3309318890a5156646b28874e97e6c1e60604d01eb495768e2' 
  AND token = '1G/c6xzNJyet63ySBnnBDggZsJex7WlPsreVCXmi6ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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