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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514f07e02296ee76cccc54cf59b8fec76ef115d176b88777663f8e3d40c42afb' 
  AND token = 'PwX0wz2byE81vrH/kuPpPlerpObAU2SUFZaAa3JLizY=' 
  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"
    }
  }
}