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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dec0f36d3513440c7c65a927fc86fadd2f134e8db4b1be7f9fa849dd31625e' 
  AND token = 'oPMsC/AigBFpmTydPPhOL7fmE07j/dmka4TyZpG90vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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