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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93a265bd7f2569fc072fa2ba8a6b9013cfb9e77fcdee2a62ad8294965c34240' 
  AND token = 'X6qdS3om8JlKeh5goBqu6NnfZCUclKI1VNcJvWACUO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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