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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7df1ee5b727034ed2dee0d5c8a41724207eeeda21796c49355225affdc9738b' 
  AND token = '6lK7JXHqQ6ilEjANkx7HSwl+0o+9aleXDk4eN8lUXJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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