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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b894d6b65c2a8f26284962b12aba34d6460aa27daa1fc02988614a59fb1a7c74' 
  AND token = 'l0wnTtR35zOzIAwAd3/A2Icf4t42bqAKY636czup+k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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