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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74cf143f9b2fea8bc5db01350430c18d9b5b3fe481141b5e70b358a1a00d33f' 
  AND token = 'w+xWreYu3Ehk4IjfiAz4y4Y5tPPqD0AENtGCIfhKhvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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