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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8748db7e92b5927383f5b3495813422a0976246b3e12ae5788627d93ad56d72' 
  AND token = 'v4SKS0FZjJ7V6RtTg1iPOhvrA7+k0eBoyivrBr1MoZE=' 
  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"
    }
  }
}