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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7803783eafae67db02ab8ae89eb6bbf410ba4d148635732a7dc98bb55eff9d5' 
  AND token = 'n6vxNiPr+XhUkUyqn71fJV8E2PY/14vrvi8CY52alU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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