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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5410dfd660e16dc8cf3720a1caae353a98a248860990bb9a51132bb53801fd4' 
  AND token = 'dQB/8XqCQO5Qi+v4ZT3Q/KL3+eyw89nwMvkvooQFeIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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