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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e210240268b6aa64739e08c5dc1418d0bac79c4e116b3dfd3ac46de2cc7db9da' 
  AND token = 'jmNDWwRcweI0WfnYnmtPNy6zyt9bv/f+eNyoJZIQZsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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