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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934d37b0dd1eeeb9766e17c213bb6e82d1964085cf72340e517d60a1be1d467c' 
  AND token = 'dqElpci7iNz9c4+PmwThc++nvyYvOaSF1/TWJWY/maw=' 
  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"
    }
  }
}