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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c861aa3a4e859bf3fa6bc7a64b05206f97aa20e28215a51db0b302ba878f490' 
  AND token = 'PaQ3D4tXk16mAgFwWzOnMaPQvkDsj8eMGG4eMhp99ms=' 
  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"
    }
  }
}