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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b1ef5cc3e02e89692ead1a9b15f846bb946256bcdab3e10c585fca7d82706b' 
  AND token = 'fqBnLTkm5f2Lh5WbuFmima348k33YPJBadEqaRDI958=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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