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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8cc453900d1b1b6d2b27bc4041c36d14c65d35de766b6adabd799a7760cc8c' 
  AND token = 'n3s6H04PQ2BtP7KZggYyQO0PIZLVrkP9ELm14Mg5akI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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