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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d06cb791f30bf268cad65222e204e7e187484347bdfd4ab2a3a2d37cfb8437' 
  AND token = 'quNgB0KTtp38yvZB1Hsy5wN7jDYPwls1SpGCovsM4tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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