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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de81cec1f965afd662d5d7007c7999869d5d0b5de556fe0a2d64206eb1629a39' 
  AND token = '8AzYm9ZUet4NI+Rt/TegKZ/2iZRj20y8Vmph1KRN3qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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