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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9850eb05b92de354d3c0686ab5f6f2f8c190959230b8e817bb423e23fe2d45f0' 
  AND token = '2xA4w+Gr+YPvCZt6rmHOo6Vrerhgq5icpLbeOwCngQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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