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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '646f407c761c4a298a18bc6cb4c9b596454507e31d31741521aa37e00991d723' 
  AND token = '0QhJYQ3f8r1bvw5cPRvHY6eBkB/j92g0gO75EkuWKLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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