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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73be24ba1ee028a371746f4c0c5f79e65094313697c2da06ecb8edddc607d776' 
  AND token = 'cTprzCN8btIwHMCpnLpdNzyZadt8UuORcHKBb+45Iy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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