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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef1840138fba9ff928532565a22895e8380e690fd1d127548f6f944bcafec1f' 
  AND token = 'kE3ahvztFvYqo3jauAcq2dU1ZJ6bdJOsJxvhnK5s+vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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