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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6540f7402e00e6a273e0a1e6f3dcae63d2b6872e2d409c780a345cbe5876f059' 
  AND token = '7AcVSH7qAcobi6ee+0pNqx7ad5pHABs3TsklCJ01vmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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