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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f986813915659243df0cbbbadb4f9fa3436347ce1dc1f5298d4b1773d30024' 
  AND token = 'yyrr/z62S0HvH0flLgfoClRS+eUZff8R9vp+PTNDYwg=' 
  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"
    }
  }
}