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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baee2ce6afa53a4434b07cde100f8d4320a367ca57c2bcf7c12d220e456575c2' 
  AND token = 'ymERQxr+Pmws/IucXJsNszfkD28Mrxj7NgG0CBE4gX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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