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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126f46210c8b1b94688c72ba22ed29b3db174c6eca55efe359215b4632c5971e' 
  AND token = 'SN9ECT50O7eZRKjuSw1Hy/I8RCmfnwC6tr6Bakbck2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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