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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b755a1cdd6bf69116ddc94fc3736a1b7a8e0eac151372c06145a60f753b15fbd' 
  AND token = '2nXtXbph9yS4YS7W/9Z3SvOsdwgfZ0jIu3V+vy8eg5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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