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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52498fc4451dd8fd5f73360fcdb8a731cc92ccda1a6c2f2e711cc3383e24f9b8' 
  AND token = 'ytK2rHKusv8cVf20C9If1nvwcZJTWzVR8HOoYEFdFE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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