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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01805bc2df0e636723abdb24b9752dc1d7260d22dce526e2883a85a88a0e49c' 
  AND token = 'R3vnthnx3kTgGWFJTn/yhPvGAEl9y3Jb76V1AtZ35z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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