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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adecb5ff7f6d3b54bb4c2e43bc271f2558d190f7f7cfd6c6d125de574234d41' 
  AND token = 'RGBFPuYMCUDjcuoyEupPO0CSxJlOPiCaL4t7zygyXXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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