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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b505ea1dd5f4fee786b2724b4804c317130dfa3efb38ebf4c240c8dc2e7c76' 
  AND token = 'FLj90bJmdOIZMRE3p6OoU09Yu5a2M7nH2oHWQFGrP6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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