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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc8b70fee0f7e72cd66b94b9e4dfcc6802d6e1cd0f743e4c29aa25b9c6b79c5' 
  AND token = '/OwzUBwkO5Jt4E1dVj/RXmUUv/gz43nOfo7GFFTawtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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