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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffe2b74a652a2d5efc3416bbe991416afcd3d83f0c5c1a26f357e26f2db6a7c' 
  AND token = 'zWbZX69wc7rkpSXXTTb+5Ebn9aak0SOcyrdFTe+NsCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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