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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9480c4a96d181db8186466243f0ec37fb4496abb3019f0047878a048b97c1b0' 
  AND token = '3tg1gRwqiqomwZ84i2m5WOAhHyxG+KW0ncg8t45Ldo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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