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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288bad1dfa8c94406a8b34a25486c95d50a853360b3d6ba10ded6d6c46931dfc' 
  AND token = '/PMaEA6JBiM79/Rb9RTwT78C0MeYzKLXqSa7TspWqYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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