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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00b90637fbefeb547dd3e6d163d10ccf00b0f7dbdfe328d4f57e5c5ad42c76a' 
  AND token = 'scqSqfUaPTsMY+eCLAAquFarDczo3HW1KmjDTaeY0R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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