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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555f2742118dd3e912e2ef77426d0cb50b23898809b7946e6e9518e200d348ee' 
  AND token = 'GlTEOm6tWmfzObGxISQI1XUEAyhPw/dW8LzcoVmKcJM=' 
  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"
    }
  }
}