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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c1ac56055bae6e2bc3a05e9c02fd0379c37d9905529e078659f32f00629000' 
  AND token = 'UjEi4scgS+adZ0pRBmjrT8AwsFotc9ZGhHs01NeTcPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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